Nanoparticles, specifically magnetosomes, synthesized in nature by magnetotactic bacteria, are very promising to be usedin magnetic hyperthermia in cancer treatment. In this work, using the solution of the stochastic Landau-Lifshitz equation, we calculate the specific absorption rate (SAR) in an alternating (AC) magnetic field of assemblies of magnetosome chains depending on the particle size , the distance between particles in a chain , and the angle of the applied magnetic field with respect to the chain axis. The dependence of SAR on the / ratio is shown to have a bell-shaped form with a pronounced maximum. For a dilute oriented chain assembly with optimally chosen /ratio,a strong magneto-dipole interaction between the chain particles leads to an almost rectangular hysteresis loop, and to large SARvaluesin the order of 400-450 W/g at moderate frequencies = 300 kHz and small magnetic field amplitudes = 50-100 Oe. The maximum SAR value only weakly depends on the diameter of the nanoparticles and the length of the chain. However, a significant decrease in SAR occurs in a dense chain assembly due to the strong magneto-dipole interaction of nanoparticles of different chains.
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| http://dx.doi.org/10.3390/nano10071320 | DOI Listing |
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